H1 tag or H2 tag?.

[niharikajain]

Its use should be based around hierarchy, H1 is generally used for the main header title for a section of a page whereas H2 would be the title for a subsection of this. Think of them like chapter and section headings in a book where the first chapter (<h2>) starts right after the title of the book (<h1>). The h2 tag should generally be a description of the h1 tag.

How Google treats the tags are down to structure, don't think of them as whether or not they're unique, but rather whether they're relevant to what you're trying to deliver on the page.